Oral liquids colouring

Solutions Suspensions Emulsions Solubilisates Oral liquids Syrup Flavour Acceptable daily intake Colour Taste Feeding mbe Preparation Formulation... 

A flavouring agent includes the existing taste in a flavour that is experienced as less unpleasant. Apart fi-om a suitable flavour also a smell suiting the basic taste has to be added. For example, if an xmpleasant bitter or sour tasting oral liquid has a smell that suggests the bitter, respectively sour taste, the preparation will be experienced as less unpleasant. The colour may also play a part by arousing a particular taste. 

Only water-soluble colouring agents are processed in oral liquids (Table 23.11). They are, whether or not through a dilution, dissolved in the preparation. Colouring agents that do not dissolve in water (often inorganic substances pigments) cannot be processed in liquid forms. 

Oral liquid preparations should be checked after preparation and packaging on appearance, labelling and container. Depending on the type of preparation the clarity, resuspendability or colour additionally should be checked. 

Solutions should be clear and practically free of particles. The oral liquid should be colourless unless an active substance or excipient has its own colour. 

Elixir are liquid, oral preparation of potent or nauseous medicaments, which are pleasantly flavoured and coloured with suitable agents. 

In France, it is the custom before a meal to partake of an aperitif, usually an aniseed-flavoured spirit called pastis. Pastis (e.g. Ricard , Pernod ) when it comes out of the bottle is a clear, light brown coloured solution of volatile oils from the seeds of the anise plant (Pimpinella anisum), which impart the characteristic aniseed flavour to the drink, dissolved in approximately 40% v/v ethanol. When a pastis is drunk, it is mixed with water and ice, whereupon the liquid becomes cloudy. This happens because the anise oils are hydrophobic, non-polar liquids and not very water-soluble. They are only held in solution by the high alcohol content of the drink. When the alcohol is diluted with water, the oils come out of solution and form an emulsion of oil droplets in the aqueous phase. This is what gives the drink its cloudy appearance. Oral solutions of anise oils have been used pharmaceutically for their carminative action and as an aid to digestion for many years, although it seems to this author preferable to consume anise oils in the form of a pastis, rather than in the form of a bottle of medicine. 

Oral powders are preparations consisting of solid, loose, dry particles of varying degrees of fineness. They contain one or more active substances, with or without excipients and, if necessary, colouring matter (...) and flavouring substances. They are generally administered in or with water or another suitable liquid. They are presented as single-dose or multidose preparations [6]. 

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See also in sourсe #XX -- [ ]

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